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Observer Performance in Assessing Anemia on Thoracic CT

Rachel S. Title1,2, Keith Harper1, Erik Nelson1, Tom Evans1 and Richard Tello1,3

1 Department of Radiology, Boston Medical Center, Boston University, Boston, MA 02118.
2 Present address: Department of Radiology, New York-Presbyterian Hospital, New York Weill Cornell Medical Center, 525 E 68th St., Starr Pavilion, Box 141, New York, NY 10021.
3 Deceased.



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  		Fig. 1 —Graph shows correlation between density in Hounsfield units and hemoglobin levels in all 102 patients.

 


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  		Fig. 2 —Graph shows correlation between hemoglobin levels versus density in Hounsfield units in men.

 


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  		Fig. 3 —Graph shows correlation between hemoglobin levels versus density in Hounsfield units in women.

 


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  		Fig. 4 —Graph shows receiver operating characteristic curve analysis of CT density in Hounsfield units as discriminator of anemia with hemoglobin level of less than 12 as cutoff.

 


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  		Fig. 5 —Graph shows receiver operating characteristic curve fit for binormal curves for ability of all observers to discriminate anemia from nonanemia.

 

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